The Access Downhole Variable Diverter Sub (VDS) creates a means of increasing the annular flow rate during a treatment without exceeding the limitations of the equipment below it in the BHA (PDM, ERT, etc.). This is accomplished by an internal set of components that utilize both mechanical and hydraulic actuation.

The mechanical function helps balance the hydraulic activation, creating a damper for the fluid diversion. It allows for a smooth transition at higher flow rates and fluid pressures, as well as a more consistent flow curve (closer to parabolic).

With dual stage activation, motor starvation is minimized due to the mechanical function of the tool. Over-spinning is mitigated through both the nozzle selection before the treatment and the hydraulic actuation during the treatment.

The utilization of FLUENT™ permits the creation of the proper fluid diversion ratios based on real-world fluid samples. This design allows the Access Downhole Variable Diverter Sub to both be proposed with and provide realistic targeted treatment rates and pressures.

The Access Downhole Variable Diverter Sub is fully adjustable, as well as capable of being redressed in a field environment. It also consists of few internal parts, aiding in making the tool robust enough for the rigors of the current thru-tubing BHA offerings.